Am I doing anything wrong?

Hi all. I’m on income based ESA and been overpaid by the dwp for a long time because I’m over the 6k limit. I completely forgot about the 6k limit a few months or so again and when I found out I panicked and reported it to them as soon as I could. But now I keep reporting it to them and they’re not doing anything. This doesn’t mean I’m committing fraud does it? As my mum is my appointee she has to speak to them, the last time she did they said they could see on the system that we’d called before and that she needs to drop one of my bank statements into the local dwp office. Which she did. And they said they’d be in touch but they still haven’t been. We keep reporting the savings and me doing voluntary work to them but they’re not doing anything. We won’t get into any trouble for this will we? If doesn’t mean we’re committing fraud does it?